Here is Commander Keen 1 Gold Edition, A.K.A. pseudo-version 1.35 since it's unofficial fanmade tribute (last official is 1.34). It's an updated and enhanced version of the original game with new levels + old levels with fixes, edits.

Note that this gold edition has been divided into two parts due to the regular numbering of the levels (because of this, the mod was 31, so there are part A and B for this to have 16+16 separatedly. For more info read Readme.txt. Have fun!

Man, the new set of levels is excellent! Loved the ambience of these levels. I truly enjoyed playing them. I completed all but the secret level - I haven't found it yet, but I think I will find it one day because I'm definitely going to play this pack again in the future. Great job.